Barcelona's Denis Suarez sent a new shock to the manager and his Basque coach Ernesto Valverde despite his participation against Levante in the King's Cup.
Suarez went into the first leg at Ciutat de Valencia on Thursday.
The 23-year-old won a penalty in the 84th minute by Philippe Coutinho, who scored a goal to revive Barcelona's hopes of qualifying for the next round, saw Suarez's penalty kick.
But Denis rejected the attempts of the Catalan administration and coach Valverde, and there was a great insistence on his part to refuse to continue in the team and asked them to approve his departure to Arsenal.
Barcelona is currently negotiating with the Gangers to successfully complete the loan with the end-of-season lending system, with a condition that allows for the final purchase in July.